[issue23882] unittest discovery doesn't detect namespace packages when given no parameters

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +23405
pull_request: https://github.com/python/cpython/pull/24621

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23882>
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